A backlight unit for a dynamic image and a display employing the same are provided. The backlight unit is used for a light source of a display and includes light-emitting devices located separately on a substrate, an image analyzer which analyzes an image signal and extracts position information on a region requiring the relative increase or decrease of brightness, and a control unit which independently drives and controls the light-emitting devices located in a region corresponding to the position information inputted from the image board. Accordingly, the display employing the backlight unit can provide a more dynamic and realistic image.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A backlight unit comprising: a plurality of light-emitting devices which are disposed in a plurality of regions on a substrate, wherein the light-emitting devices are controlled with respect to each of the plurality of regions and each of the light-emitting devices comprises a cap and a plurality of light-emitting device chips emitting light having at least two wavelength ranges within the cap, and emits white light by totally reflecting the light having the at least two wavelength ranges and mixing the light having the at least two wavelength ranges within the cap; an image board which has a reference value and analyzes an image signal which is input by an image signal unit by comparing the image signal with the reference value, thereby obtaining position information corresponding to a region having a relatively higher or lower brightness than the reference value; and a control unit which controls a brightness of the light-emitting devices located in the region corresponding to the position information obtained by the image board, wherein light-emitting devices located in a same region are driven together and light-emitting devices located in different regions are separately driven, wherein each of the plurality of light-emitting devices further comprises a base and a plurality of light-emitting device chips disposed on only a periphery of the base, and wherein the plurality of light-emitting device chips disposed on only the periphery of the base include at least two first type light-emitting device chips each having a first wavelength range, at least two second type light-emitting device chips each having a second wave length range and at least two third type light-emitting device chips each having a third wave length.
2. The backlight unit of claim 1 , wherein the control unit controls the brightness of the light-emitting devices by adjusting at least one of a voltage and a current which is applied to the light-emitting devices.
3. The backlight unit of claim 1 , wherein the cap has a larger refractive index than a refractive index of an adjacent external medium.
4. The backlight unit of claim 1 , wherein the cap has a cone shape that has a circular base and a curved side tapering to a point without a planar side in the curved side.
5. A backlight unit comprising: a plurality of light-emitting devices, wherein each of the light-emitting devices comprises a cap and a plurality of light-emitting device chips emitting light having at least two wavelength ranges within the cap, and emits white light by totally reflecting the light having the at least two wavelength ranges and mixing the light having the at least two wavelength ranges within the cap; an image board which has a reference value and analyzes an image signal which is input by an image signal unit by comparing the image signal with the reference value, thereby obtaining position information corresponding to a region having a relatively higher or lower brightness than the reference value; and a control unit which controls a brightness of the light-emitting devices located in the region corresponding to the position information obtained by the image board, wherein light-emitting devices located in a same region are driven together and light-emitting devices located in different regions are separately driven, wherein each of the plurality of light-emitting devices further comprises a base and a plurality of light-emitting device chips disposed on only a periphery of the base, and wherein the plurality of light-emitting device chips disposed on only the periphery of the base include at least two first type light-emitting device chips each having a first wavelength range, at least two second type light-emitting device chips each having a second wave length range and at least two third type light-emitting device chips each having a third wave length.
6. The backlight unit of claim 5 , wherein the control unit controls the brightness of the light-emitting devices by adjusting at least one of a voltage and a current which is applied to the light-emitting devices.
7. The backlight unit of claim 5 , wherein the control unit drives the light-emitting devices separately.
8. The backlight unit of claim 5 , wherein the control unit controls a plurality of adjacent light-emitting devices together.
9. The backlight unit of claim 5 , wherein the image board uses a reference value for evaluating brightness.
10. The backlight unit of claim 5 , wherein the cap has a larger refractive index than a refractive index of an adjacent external medium.
11. The backlight unit of claim 5 , wherein the cap has a cone shape that has a circular base and a curved side tapering to a point without a planar side in the curved side.
12. A display device comprising: a plurality of light-emitting devices which are disposed in a plurality of regions on a substrate, wherein the light-emitting devices are controlled with respect to each of the plurality of regions and each of the light-emitting devices comprises a cap and a plurality of light-emitting device chips emitting light having at least two wavelength ranges within the cap, and emits white light by totally reflecting the light having the at least two wavelength ranges and mixing the light having the at least two wavelength ranges within the cap; an image board which has a reference value and analyzes an image signal which is input by an image signal unit by comparing the image signal with the reference value, thereby obtaining position information corresponding to a region having a relatively higher or lower brightness than the reference value; and a display panel which forms an image using light emitted from the light-emitting devices and the image signal from the image signal unit, wherein light-emitting devices located in a same region are driven together and light-emitting devices located in different regions are separately driven, wherein each of the plurality of light-emitting devices further comprises a base and a plurality of light-emitting device chips disposed on only a periphery of the base, and wherein the plurality of light-emitting device chips disposed on only the periphery of the base include at least two first type light-emitting device chips each having a first wavelength range, at least two second type light-emitting device chips each having a second wave length range and at least two third type light-emitting device chips each having a third wave length.
13. The display device of claim 12 , wherein the cap has a cone shape that has a circular bottom and a curved side tapering to a point without a planar side in the curved side.
14. A display device comprising: a plurality of light-emitting devices, wherein each of the light-emitting devices comprises a cap and a plurality of light-emitting device chips emitting light having at least two wavelength ranges within the cap, and emits white light by totally reflecting the light having the at least two wavelength ranges and mixing the light having the at least two wavelength ranges within the cap; an image board which has a reference value and analyzes an image signal which is input by an image signal unit by comparing the image signal with the reference value, thereby obtaining position information corresponding to a region having a relatively higher or lower brightness than the reference value; a control unit which controls a brightness of the light-emitting devices located in the region corresponding to the position information obtained by the image board; and a display panel which forms an image using light emitted from the light-emitting devices, wherein light-emitting devices located in a same region are driven together and light-emitting devices located in different regions are separately driven, wherein each of the plurality of light-emitting devices further comprises a base and a plurality of light-emitting device chips disposed on only a periphery of the base, and wherein the plurality of light-emitting device chips disposed on only the periphery of the base include at least two first type light-emitting device chips each having a first wavelength range, at least two second type light-emitting device chips each having a second wave length range and at least two third type light-emitting device chips each having a third wave length.
15. The display device of claim 14 , wherein the cap has a cone shape that has a circular bottom and a curved side tapering to a point without a planar side in the curved side.
16. A method of displaying a dynamic image, the method comprising: analyzing an image signal which is input by an image signal unit by comparing the image signal with a reference value; collecting brightness information of an image from the image signal; obtaining a brightness deviation having a relatively higher or lower brightness than the reference value from the brightness information; obtaining position information of a display panel corresponding to the brightness deviation; controlling a brightness of light-emitting devices located in a region corresponding to the position information, wherein light-emitting devices located in a same region are driven together and light-emitting devices in different regions are separately controlled and each of the light-emitting devices comprises a cap and a plurality of light-emitting device chips emitting light having at least two wavelength ranges within the cap, and emits white light by totally reflecting the light having the at least two wavelength ranges and mixing the light having the at least two wavelength ranges within the cap, wherein each of the light-emitting devices further comprises a base and a plurality of light-emitting device chips disposed on only a periphery of the base, and wherein the plurality of light-emitting device chips disposed on only the periphery of the base include at least two first type light-emitting device chips each having a first wavelength range, at least two second type light-emitting device chips each having a second wave length range and at least two third type light-emitting device chips each having a third wave length.
17. The method of claim 16 , wherein the controlling the brightness of the light-emitting devices comprises controlling the brightness of the light-emitting devices by adjusting at least one of a voltage and a current which is applied to the light-emitting devices.
18. The method of claim 16 , wherein the cap has a larger refractive index than a refractive index of an adjacent external medium and totally reflects incident light.
19. The method of claim 16 , wherein the brightness information is brightness information corresponding to a plurality of regions.
20. The method of claim 16 , wherein the light-emitting devices are located in a plurality of regions, and light-emitting devices located in a same region are driven together and light-emitting devices located in different regions are separately driven.
21. The method of claim 16 , wherein the obtaining the position information comprises obtaining position information corresponding to a region requiring a relative increase or decrease of brightness.
22. The method of claim 16 , wherein the collecting the brightness information comprises analyzing the image signal to determine whether there is a region of the image requiring a relative increase or decrease of brightness.
23. The method of claim 16 , wherein, in the obtaining the brightness deviation, information corresponding to a region requiring a relative increase or decrease of brightness is obtained based on the reference value.
24. The method of displaying a dynamic image of claim 16 , wherein the has cone shape that has a circular bottom and a curved side tapering to a point without a planar side in the curved side.
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April 27, 2009
August 19, 2014
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